1 /* ------------------------------------------------------------------ 2 * Copyright (C) 1998-2009 PacketVideo 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either 13 * express or implied. 14 * See the License for the specific language governing permissions 15 * and limitations under the License. 16 * ------------------------------------------------------------------- 17 */ 18 /**************************************************************************************** 19 Portions of this file are derived from the following 3GPP standard: 20 21 3GPP TS 26.073 22 ANSI-C code for the Adaptive Multi-Rate (AMR) speech codec 23 Available from http://www.3gpp.org 24 25 (C) 2004, 3GPP Organizational Partners (ARIB, ATIS, CCSA, ETSI, TTA, TTC) 26 Permission to distribute, modify and use this file under the standard license 27 terms listed above has been obtained from the copyright holder. 28 ****************************************************************************************/ 29 /* 30 ------------------------------------------------------------------------------ 31 32 33 34 Filename: /audio/gsm_amr/c/include/g_adapt.h 35 36 Date: 02/05/2002 37 38 ------------------------------------------------------------------------------ 39 REVISION HISTORY 40 41 Description: Placed header file in the proper template format. Added 42 parameter pOverflow for the basic math ops. 43 44 Description: Replaced "int" and/or "char" with OSCL defined types. 45 46 Description: Moved _cplusplus #ifdef after Include section. 47 48 Description: 49 50 ------------------------------------------------------------------------------ 51 INCLUDE DESCRIPTION 52 53 This file contains all the constant definitions and prototype definitions 54 needed by the file, g_adapt.c 55 56 ------------------------------------------------------------------------------ 57 */ 58 59 /*---------------------------------------------------------------------------- 60 ; CONTINUE ONLY IF NOT ALREADY DEFINED 61 ----------------------------------------------------------------------------*/ 62 #ifndef g_adapt_h 63 #define g_adapt_h "$Id $" 64 65 /*---------------------------------------------------------------------------- 66 ; INCLUDES 67 ----------------------------------------------------------------------------*/ 68 #include "typedef.h" 69 70 /*--------------------------------------------------------------------------*/ 71 #ifdef __cplusplus 72 extern "C" 73 { 74 #endif 75 76 /*---------------------------------------------------------------------------- 77 ; MACROS 78 ; Define module specific macros here 79 ----------------------------------------------------------------------------*/ 80 81 /*---------------------------------------------------------------------------- 82 ; DEFINES 83 ; Include all pre-processor statements here. 84 ----------------------------------------------------------------------------*/ 85 #define LTPG_MEM_SIZE 5 /* number of stored past LTP coding gains + 1 */ 86 87 /*---------------------------------------------------------------------------- 88 ; EXTERNAL VARIABLES REFERENCES 89 ; Declare variables used in this module but defined elsewhere 90 ----------------------------------------------------------------------------*/ 91 92 /*---------------------------------------------------------------------------- 93 ; SIMPLE TYPEDEF'S 94 ----------------------------------------------------------------------------*/ 95 96 /*---------------------------------------------------------------------------- 97 ; ENUMERATED TYPEDEF'S 98 ----------------------------------------------------------------------------*/ 99 100 /*---------------------------------------------------------------------------- 101 ; STRUCTURES TYPEDEF'S 102 ----------------------------------------------------------------------------*/ 103 typedef struct 104 { 105 Word16 onset; /* onset state, Q0 */ 106 Word16 prev_alpha; /* previous adaptor output, Q15 */ 107 Word16 prev_gc; /* previous code gain, Q1 */ 108 109 Word16 ltpg_mem[LTPG_MEM_SIZE]; /* LTP coding gain history, Q13 */ 110 /* (ltpg_mem[0] not used for history) */ 111 } GainAdaptState; 112 113 /*---------------------------------------------------------------------------- 114 ; GLOBAL FUNCTION DEFINITIONS 115 ; Function Prototype declaration 116 ----------------------------------------------------------------------------*/ 117 Word16 gain_adapt_init(GainAdaptState **st); 118 /* initialize one instance of the gain adaptor 119 Stores pointer to state struct in *st. This pointer has to 120 be passed to gain_adapt and gain_adapt_update in each call. 121 returns 0 on success 122 */ 123 124 Word16 gain_adapt_reset(GainAdaptState *st); 125 /* reset of gain adaptor state (i.e. set state memory to zero) 126 returns 0 on success 127 */ 128 129 void gain_adapt_exit(GainAdaptState **st); 130 /* de-initialize gain adaptor state (i.e. free state struct) 131 stores NULL in *st 132 */ 133 134 /************************************************************************* 135 * 136 * Function: gain_adapt() 137 * Purpose: calculate pitch/codebook gain adaptation factor alpha 138 * (and update the adaptor state) 139 * 140 ************************************************************************** 141 */ 142 void gain_adapt( 143 GainAdaptState *st, /* i : state struct */ 144 Word16 ltpg, /* i : ltp coding gain (log2()), Q */ 145 Word16 gain_cod, /* i : code gain, Q13 */ 146 Word16 *alpha, /* o : gain adaptation factor, Q15 */ 147 Flag *pOverflow /* o : overflow indicator */ 148 ); 149 150 /*---------------------------------------------------------------------------- 151 ; END 152 ----------------------------------------------------------------------------*/ 153 #ifdef __cplusplus 154 } 155 #endif 156 157 #endif /* _H_ */ 158 159 160
